Such machinery have adopted the platform sewing worktable, the multi-needle needle-bar mechanism, needle bar thread-taking-up, multi-looper thread-hooking, feed dog feeding (or roller wheel feeding) to form the multi-needle multichain stitches. They are ideal for the ornamental sewing of knitting materials for the children's wear, underwear, sports wear and women's wear. The sewing speed reaches 3000 spm. The sewing performance is stable, the moment light, noise low, vibration small and the rotation is stable and smooth. As required by the sewing procedures, the ornamental top-stitch frames can be added or canceled. Needle gauge covers from 8 needle to 33 needles. Machine types of different specifications are available for users.